* clearly be heavy enough to warrant preemptive flushing. In the case
* of heavy DIO or ordered reservations, preemptive flushing will just
* waste time and cause us to slow down.
+ *
+ * We want to make sure we truly are maxed out on ordered however, so
+ * cut ordered in half, and if it's still higher than delalloc then we
+ * can keep flushing. This is to avoid the case where we start
+ * flushing, and now delalloc == ordered and we stop preemptively
+ * flushing when we could still have several gigs of delalloc to flush.
*/
- ordered = percpu_counter_read_positive(&fs_info->ordered_bytes);
+ ordered = percpu_counter_read_positive(&fs_info->ordered_bytes) >> 1;
delalloc = percpu_counter_read_positive(&fs_info->delalloc_bytes);
if (ordered >= delalloc)
used += fs_info->delayed_refs_rsv.reserved +